/Engine/Plugins/Runtime/NetworkPrediction/Source/NetworkPrediction/Public/NetworkPredictionPhysicsComponent.h
Even then, it is just sort of an example. An extra component may not be the best way to use this. It may make more sense to just put the important bits on your actor class and set the exact UpdatedPrimitive you want (really PhysicsActorHandle is all that matters!)
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType, Meta=(BlueprintSpawnableComponent)) class UNetworkPredictionPhysicsComponent : public [UActorComponent](API\Runtime\Engine\Components\UActorComponent)
FNetworkPredict...
NetworkPredictionProxy
Proxy to interface with the NetworkPrediction system.
FPhysicsActorHa...
PhysicsActorHandle
FReplicationPro...
ReplicationProxy
TObjectPtr<UPr...
UpdatedPrimitive